It's REALLY fucking short, though. If you know how to do some of the Puzzles, you could probably beat it in like, an hour and a half.
I can beat Ico in under four hours and it is one of my favorite games of all time. As long as it is somewhere near as much fun as it looks like I will enjoy it.
I've always meant to play Ico after the demo. It looked good in an artistic way.
I'll be sure to pick up the demo later. It seems that I've gotten a lot of demos lately since I'm too cheap to buy real games until I know they're good.